LTC2440IGN datasheet(9/28 Pages) LINER

Part #	LTC2440IGN

Description	24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution

PDF	28 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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9 / 28 page

LTC2440

sn2440, 2440fas

TEST CIRCUITS

FU CTIO AL BLOCK DIAGRA

Figure 1. Functional Block Diagram

AUTOCALIBRATION

AND CONTROL

DAC

DECIMATING FIR

INTERNAL

OSCILLATOR

SERIAL

INTERFACE

ADC

∑

∫

GND

VCC

IN+

IN–

SDO

SCK

REF+

REF –

SDI

BUSY

EXT

(INT/EXT)

2440 F01

–+

–

1.69k

SDO

2440 TA03

Hi-Z TO VOH

VOL TO VOH

VOH TO Hi-Z

CLOAD = 20pF

1.69k

SDO

2440 TA04

Hi-Z TO VOL

VOH TO VOL

VOL TO Hi-Z

CLOAD = 20pF

VCC

APPLICATIO S I FOR ATIO

CONVERTER OPERATION

Converter Operation Cycle

The LTC2440 is a high speed, delta-sigma analog-to-

digital converter with an easy to use 4-wire serial interface

(see Figure 1). Its operation is made up of three states. The

converter operating cycle begins with the conversion,

followed by the low power sleep state and ends with the

data output (see Figure 2). The 4-wire interface consists

of serial data input (SDI), serial data output (SDO), serial

clock (SCK) and chip select (CS). The interface, timing,

Figure 2. LTC2440 State Transition Diagram

CONVERT

SLEEP

DATA OUTPUT

2440 F02

TRUE

FALSE

CS = LOW

AND

SCK

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